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The recommendations for daily intake vary between 12-15 mg per day for men or 8-12 mg for women, and the UL (tolerable upper intake) is 40 mg. A low dose zinc supplement should be all that is needed to prevent a deficiency, although up to 30 mg is commonly taken with relative safety.
For cancer, 90 milligrams of zinc sulfate has been taken by mouth daily for five days, with a maintenance dose of 180 milligrams daily. Zinc gluconate (two tablets, each containing 10 milligrams of zinc) has also been used daily for 10 days. For chemotherapy side effects, 45 milligrams of zinc sulfate has been taken by mouth three times daily on the first day of radiation therapy, and one month after finishing treatment.